The cantilever beam type of PEH (piezoelectric energy harvester) has been widely studied for years due to simple designand effectively generate high strain and high output power. In our previously researches, the PEH unit with area of 6 mmby 9 mm has output performance around 300 μW under base excitation of 0.5g acceleration level. Moreover, we havedesigned the tapered shape cantilever beam of PEH for optimizing the beam strain distribution and verified that the outputperformance and durability are not inferior to rectangular one we have fabricated before.In this study, the tapered shape cantilever beam PEHs are chosen for durability experiment to investigate the relevanceamong output performance, fatigability and mechanical properties of devices with a long-term working period underdifferent working temperature. The result evidently shows the durability difference when the device is operated under hightemperature (50 °C) with significant natural frequency drop and the PEH could not maintain constant power output.
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